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//opt/alt/ruby18/share/ri/1.8/system/Kernel/trace_var-i.yaml
--- !ruby/object:RI::MethodDescription aliases: [] block_params: comment: - !ruby/struct:SM::Flow::P body: Controls tracing of assignments to global variables. The parameter +symbol_ identifies the variable (as either a string name or a symbol identifier). <em>cmd</em> (which may be a string or a <tt>Proc</tt> object) or block is executed whenever the variable is assigned. The block or <tt>Proc</tt> object receives the variable's new value as a parameter. Also see <tt>Kernel::untrace_var</tt>. - !ruby/struct:SM::Flow::VERB body: " trace_var :$_, proc {|v| puts "$_ is now '#{v}'" }\n $_ = "hello"\n $_ = ' there'\n" - !ruby/struct:SM::Flow::P body: <em>produces:</em> - !ruby/struct:SM::Flow::VERB body: " $_ is now 'hello'\n $_ is now ' there'\n" full_name: Kernel#trace_var is_singleton: false name: trace_var params: | trace_var(symbol, cmd ) => nil trace_var(symbol) {|val| block } => nil visibility: public
